Pressure-retaining device for air-brakes.



J. G. HUXHOLD. PRESSURE RETAININ G DEVICE POR AIB. BRAKES. l

APPLIGATION FILED JUNE 1, 1909.

95L566 l Patented Mar. s, 1910.

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J. o. HUXHGLD.l PRESSURE RETAINING DEVICE FOR AIR BRAKES.V

APPLICATION FILED JUNE 1,'1909.

Patented Mar. 8. 1910.

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JOI-IN C. HUXHOLD, 0F

CHICAGO, ILLINOIS, ARMSTRONG, OF PULIMAN, ILLINOIS.

ASSIG-NOR OF ONE-HALF T0 VARREN lJ.'

FRESSURE-RETAINING DEVICE FOR AIR-BRAKES.

To all whom it may concern:

Be it known that I, JOI-IN C. HUxHoLD, a citizen of the United States,residing at Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful 1mprovements in Pressure-RetainingDevices for Air-Brakes, of which the following is a specification.

My invention relates to improvements in air-brakes of the Westinghousetype, the ob ject of the invention being to provide a new and improvedmeans designed to permit the engineer to directly control the retainingvalves with a view of retaining the full pressure of the brake cylindersby clos ing the triple valve exhaust ports.

A further object of my invention is to provide an air-operated:retaining valve connected to the triple valve and to an auxiliary trainpipe, said valve to be held nor mally in such a position as to notinterfere with the exhausting from the triple valve.

Other objects will appear hereinafter.

ith these objects in view my invention consists in the novelconstruction and arrangement of parts which will be hereinafter fullydescribed and more particularly pointed out in the appended claims.

My invention will be more readily understood by reference to theaccompanying drawings forming a part of this specifica tion, and inwhich- Figure 1 is a plan view of brake apparatus embodying myinvention, Fig. 2 is a side elevation of the retaining valve, and Fig. 3is a central section thereof, certain parts being shown in elevation.

Referring now to the drawings, 1 designates the main train pipe, 2 abranch pipe leading therefrom and communicating with the triple valve 3;4 the auxiliary cylinder; 5 the brake cylinder, and 6 the pipe leadingthereto from the triple valve 3. The retaining valve 7 is screwed intothe triple valve 3 so as to connect with the exhaust port thereof whichis located in the center of the boss 8. The retaining valve 7 is alsoconnected to the auxiliary train pipe 9, leading" to the locomotive cab,a cut-out valve 10 being provided in connection with each retainingvalve whereby any one of which may be thrown out of operative connectionwith said auxiliary train pipe.

Although not shown in the drawings, the

Specicaton of Letters Patent.

Application filed J'une l, 1909.

Patented Mar. 8, 1910.

semi No. 499,349.

auxiliary train pipe may have flexible connections similar to the rubbertube connectionsin the regular main train pipe, and any well known meansmay be provided in the locomotive cab for creating an air pressure insaid auxiliarytrain pipe.

The preferred form of retaining valve is shown in detail in Fig. 3 andcomprises a cylindrical body 11, having a reduced threaded portion 12adapted to screw into the boss S containing the triple valve exhaustport. An axial bore 13 is provided in the threaded portion 12 to connectwith the triple valve exhaust port (not shown), said bore leading to anenlarged axial bore 14 adapted to receive the helical spring 15. In theother end of the valve a threaded portion 15, a shoulder 16, and a largeaxial bore 17 is provided, the puppet valve-seat 18 being formed betweenthe portions 14 and 17. Leading from the valve-seat 18 is a port 19which forms an exit for the exhaust from the triple valve when thepuppet valve 2O is not seated on said valve-seat. The helical spring 15surrounds the puppet valve stem 21 and seats on the shoulder 22 at theend of the bore 14, said spring being adapted to hold the valve 2O inthe normal open or dotted line position. Formed inteoral with the valve2O is a piston 22 adapted to reciprocate in the portion 17, the reducedyextension 23 of said piston having a loose lit in the axial perforation24 of the nut 25. The extension 23 is in alinement with the valve stem21 and is provided to insure the proper longitudinal movement of thepiston 22 and the valve 20.

The piston 22 is normally in the dotted line position and when forced tothe full line position by means of the pressure of the air enteringthrough the perforation 24 the bore 19 is closed, thus preventing theescape of the triple valve exhaust and producing the desired result ofretaining `the air pressure in the brake cylinders.

Various slight changes may be made in the general form and arrangementof parts described without departing from my invention, and hence I donot restrict myself to the precise details set forth, but considermyself at liberty to make such changes and alterations as fairly fallwithin the spirit and scope of the claims.

Having describedmy invention what I claim as new and desire to secure byLetters Patent is:A

1. In a device of the class described, a cylindrical retaining valvehaving a reduced threaded portion screwed into the triple valve, anaxial bore in said threaded portion communicating with the exhaust portot' said triple valve, said bore leading to an enlarged axial borehaving a shoulder at one end thereof, a helical spring in said enlargedbore seated on said shoulder and surrounding the stem of a puppet valveprovided in the device, a threaded portion and a large bore in the endot' the retaining` valve opposite said reduced portion, a seat for saidpuppet valve disposed between said lastnamed bore and said enlargedaxial bore, a port leading to the atmosphere provided in said seat, apiston integral with said puppet valve adapted to reciprocate in saidlarge bore, a reduced extension on said piston in alinement with saidstem, and a nut screwed into last named threaded portion having an axialperforation in which said extension 4is loosely itted, said puppet valvebeing seated by means of air pressure on said piston and unseated andreturned to the normal position by means of said spring acting thereon,substantially as described.

9.. In a device of the class described, in combination with an air-braketriple valve, a retaining valve screwed to an exhaust port bossprojecting from said triple valve, an axial bore in said retaining valvein communication with said exhaust port, an enlarged axial bore leadingfrom said irst named bore, a helical spring in said last named bore, avalve seat leading from said enlarged axial bore, a port in said valveseat leading to atmosphere, a puppet valve having a valve stemsurrounded by said spring, the latter being adapted to maintain saidpuppet valve in the normal or open position, an auxiliary train pipeconnecting said retaining valve with the locomotive cab, and means insaid retaining valve for closing said puppet valve and said port whenacted upon by air pressure under the control of the engineer,substantially as described.

3. In a device of the class described, a triple valve and an auxiliarytrain pipe having a retaining valve interposed therebetween. meanswhereby the exhaust from said triple valve may [low into a valve spaceprovided in said retaining valve, a puppet valve and seat in saidretaining valve, a port in said seat to permit the exhaust to Howdirectly to atmosphere, and a piston integral with said puppet valveadapted to close the same and said port when acted upon by airpressureunder the control ot the engii'leer, substantially as described.

ln testimony whereof I have signed my name to this specification in thepresence ot two subscribing witnesses.

JOHN G. HUXlilOLD.

lVitnesses JosI-IUA R. H. Po'rTs, HELEN F. LiLLis.

